I have an elusive air leak. I have changed all fittings from the pump suction inlet to the point where the suction pipe goes underground back to the skimmer. New skimmer weir, all new els, and couplings and gaskets with the exception of the pot lid and gasket which i have on order. If the new lid and gasket do not solve the problem, any ideas on what i might try next prior to digging up pipes and breaking up concrete?
In case its important, the wall fitting in the deep end where the water returns to the pool has lots of air bubbles while the one on the shallow end does not.